Ejector type boom



Feb. N, 1969 F. R. WALESON ET AL 3,426,914

EJECTOR TYPE BOOM Filed March 15, 1967 INVENTORS FREDERIK R WA LESO;

ROCHE J. VAN DE HEY Y R R A B E D L A N O R United States Patent 3,426,914 EJECTOR TYPE BOOM Frederik R. Waleson, 1945 NW. Lamont Ave., Roseburg,

Greg. 97470, and Roche J. Van De Hey, 801 E. 3rd

Ave., Sutherlin, Oreg. 97479 Filed Mar. 13, 1967, Ser. No. 622,796

US. Cl. 212-1 Int. Cl. B66c 23/62 2 Claims ABSTRACT OF THE DISCLOSURE This invention relates to the erection of booms for cranes and is more specifically directed to a boom butt erecting frame and the method of its use.

Booms for cranes are generally composed of a plurality of substantially identical sections which are connected at the job site to form the boom and then raised to the desired height. Each section must be separately handled and held in position while the connecting pins are inserted into the frame in the boom sections. Generally the sections are laid end to end on the ground and then connected together. This involves a considerable period of time in order to properly place the sections for inter-connection as well as special handling of each section prior to connection with the previous section.

One of the principal objects of the present invention is to provide a means for reducing the time required to erect or disassemble a boom for a crane.

Another object of the present invention is to provide an attachment for a crane which can be used to erect or disassemble the boom.

These objects are accomplished by mounting an improved boom butt frame directly onto the front of the crane. The boom butt frame is made with a length slightly longer than the length of the boom sections and generally less than the length of two boom sections. An opening is provided either in the top, side or bottom of the section through which the boom sections can be lowered into or out of the boom butt frame or pushed in or pulled out through the side or bottom of the boom butt frame. Manual or hydraulic means can be -"used for connecting a boom section with the preceding section while the boom section is still in position in the boom butt frame. A winch or hydraulic, mechanical or pneumatic means is then used to push the now connected or assembled boom section out of the end of the boom butt frame a distance sufficient to allow clearance for the next boom section to be inserted into the boom butt frame. Each succeeding section can then be quickly attached to the preceding section and moved outward in a horizontal direction. The outer end of the boom can be provided with either a folding type dolly with wheels to support the end of the boom as the boom is erected or the boom top can be so constructed that the sheaves can be used to support the boom as it is moved horizontally out of the boom butt frame.

Other objects and advantages will become more readily apparent from the following detailed description when read in connection with the accompanying drawings, in which:

FIG. 1 is a top view of the boom butt frame with the 3,426,914 Patented Feb. 11, 1969 boom sections shown extending outward from the end of the frame.

FIG. 2 is a side view of the boom butt frame show ing one of the boom sections in position for connection to or disassembly from the preceding section.

FIG. 3 is a side view of a boom section.

FIG. 4 is a view taken on line 44 of FIG. 2 showing the boom.

Referring more particularly to the drawings, a boom butt frame 10 is shown with a boom 12 extending outward from the end of the frame. The boom includes a number of boom sections 26 which are connected together by pins 32 at the intersection of their pin connectors 28. Each boom section 26 includes longitudinal members 38 interconnected by cross members 40.

A boom top 30 is secured to the outer end of the first boom section by pins 32 which are inserted through connectors 28. The upper and lower longitudinal members 33 and 35 are interconected by cross members 37. A sheave 34 is mounted for rotary motion on a shaft 36 located at the end of the boom section.

The boom butt frame includes longitudinal members 14 and support members 22 connected at the forward end by cross plate 16 and side plates 18. Connecting members 20 are used to secure the back end of the longitudinal and support members together. The support members are provided on the bottom of the frame to support the boom sections as they are lowered into the frame. Rearwardly extending brackets 24 are secured to the connection members 20 on the sides of the frame and are provided with apertures 25 for pivotal connection to crane support brackets 23.

A hydraulic ram 42 is positioned at the rear of the frame between brackets 24. The ram is of a single or a double acting type and has a piston 46 which extends into the center of the boom butt frame and is supported by a carriage 47. A mechanical or pneumatic device could be used to do the same thng, i.e., mechanical reversing winch and cable; rack and pinion; or air piston. A pusher plate 48 is secured to the end of the carriage in a position to engage the end of a boom section located in the frame. On actuation of the cylinder the pusher plate will move a boom section in the frame to the far end to provide room for the next boom section. The piston is then withdrawn and another boom section dropped into the boom butt frame. The plate can also be used to pull the boom into the frame for disassemby.

To aid in assembling the boom sections, hydraulic, pneumatic, mechanical or manual pin setters 50 may be mounted on plates 18 at the forward end of the boom frame. The boom sections are then moved so that the rear connectors 28 are located opposite the pin setter. The front connectors 28 on the next boom section are then located opposite the pin setters. Pins 32 are pushed through the connectors to hold the boom sections together. The pins could also be pulled from the connectors by the pin setters on disassembly.

The boom top may be provided with a wheel assembly 52 to support the end of the boom as it is pushed out of the boom butt frame. This wheel assembly can include a ground roller 54 mounted on a pair of support arms 56 and a folding leg 58. This will allow the wheel to be collapsed into the boom top frame when not in use.

It is also possible to use the boom top as shown in FIG. 2 as the supporting structure by placing connecting links on the top between the connectors 28 on the boom top and the forward connectors on the boom section. The boom top will be pivoted downward at an angle with respect to the boom in the form of a hammerhead boom with the sheave 34 resting on the ground. The ground roller 54 and support arms 56 can then be removed from the boom top. The sheave will then act as a wheel to support the boom as the boom is moved horizontally out of the boom butt frame.

What is claimed is: 1. An ejector type boom comprising a plurality of sections adapted to be joined end to end, a boom butt frame adapted to be pivotally connected to a crane for movement from a vertical to a horizontal position and having a length greater than the length of one of the boom sections and an opening for receiving said sections when the boom is in the horizontal position, means for moving a boom section located in said butt frame longitudinally in said frame a distance sufiicient to provide clearance for another boom section, a boom top adapted to be connected to the top section,

a pair of links secured between said top section and one side of said 'boom top,

and a sheave in the boom top to provide a rolling support for the end of said boom.

2. An erecting frame according to claim 1 wherein said moving means comprises a hydraulic ram located at one end of the frame.

References Cited UNITED STATES PATENTS 2,874,851 2/ 1959 Scheuerpflug 212144 3,306,470 2/1967 Green ,212-144 3,319,803 5/1967 Northcott 212-55 2,998,106 8/1961 Aust 52111 3,080,068 3/ 1963 Felkner 212-144 3,185,265 5/1965 White 52-111 3,194,412 7/ 1965 Kerridge 212-46 FOREIGN PATENTS 31,841 7/1910 Sweden. 179,557 6/ 1962 Sweden.

EVON C. BLUNK, Primary Examiner.

20 H. C. HORNSBY, Assistant Examiner.

US. Cl. X.R. 

